Nintendo has had at least one big game for their home console every 4th quarter for as long as I can remember. I'm not worried about this at all.
I imagine they are spreading out their launch window games because otherwise they wouldn't have anything else ready for the 2nd and possibly 3rd quarter. I'm expecting something bigger than NSMBU towards the end of the year. Then again I might be dissapointed to find out it's Mario Party 10 or something. I still remember that year Nintendo's holiday releases consisted of Wii Music and Animal Crossing: City Folk. Hardly games for core gamers.







